Equipment Acquisitions and Dispositions - Schedule of Vessel Acquired and Disposed (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2021 Vessel	Dec. 31, 2020 Vessel	Dec. 31, 2019 Vessel
Property Plant And Equipment [Line Items]
Number of Equipment Removed from Service Excludes from Major Equipment Dispositions		3
Platform Supply Vessels
Property Plant And Equipment [Line Items]
Number of equipment acquired excludes from deliveries of offshore support vessels	5	7
Crew Transfer Vessels
Property Plant And Equipment [Line Items]
Number of equipment held for sale excluded from deliveries of offshore support vessels		3	2
Offshore Support Vessels, Liftboats
Property Plant And Equipment [Line Items]
Number of Equipment Removed from Service Excludes from Major Equipment Dispositions	4
Anchor Handling Towing Supply
Property Plant And Equipment [Line Items]
Number of Equipment Removed from Service Excludes from Major Equipment Dispositions		2
Specialty Vessel
Property Plant And Equipment [Line Items]
Number of Equipment Removed from Service Excludes from Major Equipment Dispositions		1